Genesis states that man was formed from dust of the ground, and this first man, Adam, went on with Eve to populate the Earth. This happened before 4000 BC, according to Bishop James Ussher (1581-1656), who precisely dated the creation of everything as occurring the night before Sunday, October 23, 4004 BC.
Modern cosmological evidence puts the date of the universe a bit earlier, roughly 13.75 billion years ago, give or take a few decades. Presumably the first human came after this, though the exact date depends on how you define “first human.”
But this large placard, in Howard County, Maryland, suggests Adam the First dates back to sometime before 1668. This opens up the intriguing possibility that Adam is younger than Bishop Ussher, which would certainly be a surprise to the Bishop.